ML18051A267
| ML18051A267 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/06/1983 |
| From: | Toner K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-09-03, TASK-9-3, TASK-RR NUDOCS 8301110588 | |
| Download: ML18051A267 (2) | |
Text
consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (517) 788-0550 January 6, 1983 Dennis M Crutchfield, Chief Operating Reactor Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commisssion Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
SEP TOPIC IX-3, "STATION SERVICE AND COOLING WATER SYSTEMS",
SUMMARY
OF SERVICE WATER SYSTEM PERFORMANCE ADEQUACY ANALYSIS As committed in Consumers Power Company letter dated October 15, 1982, we have completed a detailed analysis of the Service Water System (SWS) flow require-ments to address SEP Topic IX-3, "Station Service and Cooling Water Systems" for the Palisades Plant.
~his letter provides a summary of the results of the analysis and the remedial actions taken to resolve this issue.
The analysis of the SWS was performed to determine if critical safety-related equipment received adequate SWS flow following a Loss of Coolant Accident (LOCA) with a concurrent loss of offsite power and a single failure of a diesel generator.
The analysis revealed that with a loss of instrument air caused by a loss of offsite power, the valves controlling SWS flow to the Component Cooling Water Heat Exchangers (CCWHX) would go full open.
This scenario results in large flows through the CCWHX and a decrease in system pressure.
As a consequence, if a diesel generator was assumed to fail, then less than three SWS pumps would be available and "calculated" flows to safety-related critical equipment would not be adequate.
This problem was reported in LER-82-24 (dated 9/17/82) and was corrected by equipment and procedural modifications.
As documented in the LER, hard stops were installed on the operators of the CCWHX valves to limit the service water flow in the event a loss of instrument air occurs.
In addition, emergency operat.ing procedures were revised to require alignment of the Fire Water System to the SWS if there is only one service water pump available.
As a result of these modifications, adequate SWS flow is available to critical safety-related equipment following a LOCA.
OC0183-0001A-NL02
DMCrutchfield, Chief Palisades Plant SEP Topic IX-3 January 6, 1983 Consumers Power Company believes that the actions implemented adequately address this open item and, therefore, constitute completion of this SEP topic.
Kerry A Toner Senior Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades OC0183-0001A-NL02 2